Rock-drill.



No. 813,828. PATENTED FEB. 27, 1906.

B. A. RIX.

ROCK DRILL.

APPLICATION FILED AUG. 16 1906.

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Feb. 27, 1906.

Application filed. August 16, 1905. Serial No. 27 L487.

To all whom it may concern:

Be it known that I, EDWARD A. Rix, a citizen of the United States, residing in the city and county of San Francisco and State of California, have invented new and useful Improvements in Rock-Drills, of which the following is a specification.

My device relates to an improvement in rock-drills.

It consists in the combination of devices and in details of construction, which will be more fully explained by reference to the accompanying drawings, in which Figure 1 is a longitudinal section of my device. Fig. 2 is a partial section showing the triangular shape of the shell or guide.

The shell of the cylinder 7 has a guide 8 cast upon one side, and this guide fits and slides in a corresponding shell 9 or part and in which it is supported. In the usual construction of these parts loose adjustable strips of various shapes are bolted to the shell, generally upon the upper side, and these are used to take up the wear either by planing or filing them or by removing shims from between them and the main shell-casting, and in some cases the bolts holding the strips to the shell are sometimes made eccentric, so that by turning them inward and downward pressure may be applied to the strips. Such a guide-surface is of small area, and the numerous bolts and nuts are liable to jar loose, and in various ways its construction is unsatisfactory. In starting holes When drilling difficulty is also experienced with drills having ordinary guides from the fact that the excessive vibration due to the slipping of the drill-point upon the rock produces corresponding wear and vibration in the parts. My invention is designed to remedy this difficulty and to hold the drill stifliy to the work; and it consists in such construction of the shell and guide that but one motion in one direction is necessary to take up the wear of all sides.

The shell 9 andguide 8 are made of triangular form, the shell being in one solid piece, as shown. Inside and lying on the bottom is a take-up plate 10, which extends-the entire length of the shell and having projections 10 at each end, which engage the ends of the shell, thus keeping the plate in position endwise.

Two or more studs 11 of large diameter are screwed into the bottom of the shell between the center and the ends, and these serve to raise or lower the take-up plate to any desired degree, and they are secured in place by lock-nuts 11 It will be seen that when the plate is pressed upwardly the wear or slack is not only taken up on the bottom, but on both sides of the cylinder-guide, thus requiring but one movement to take up the entire wear. The extended triangular projection at the bottom of the cylinder that serves as a guide has a large surface, which reduces the wear and at the same time serves as a cover and protection for the feed-screw.

Various devices may be substituted for the take-up screw, such as thin material placed between the parts but the essential feature of my invention is that the construction of the guides and parts is such that all wear and loo'seness in every direction may be adjusted by a take-up movement in a single direction.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination in a rock-drill, of a cylinder, having a slide fixed to and projecting from its bottom, a shell within which said slide is movable, the bottom of said slide and the bottom of the guide being spaced from each other, and means operable in said space between said bottoms and adjustable in one direction to compensate for wear between the bottom and also the sides of said guide.

2. In a rockdrill, a slide cast integral with the cylinder and parallel with the bore thereof, said slide having diverging sides, a shell having corresponding interior surfaces between which the slide is movable, the bottom of the slide and the bottom of the guide being separated from each other, and a wear-plate in the space between said bottoms and adjustable in one direction whereby contact between said surfaces is maintained and wear compensated.

3. In a rock-drill, a cylinder, a slide cast integral with and upon one side of said cylinder, and having divergent sides, a shell having corresponding sides within which the slide is movable, a take up plate bearing against the bottom of the slide and occupying a space between the bottom or outer surface of the slide and the interior of the shell, and means for adjusting said plate.

4. The combination with a rock-drill and the cylinder thereof of a hollow shell, with upwardly convergent sides, a projection In testimony whereof I have hereunto set from the bottom of the cylinder with sides fitmy hand in presence of two subscribing witting and slidable against the sides of the nesses.

shell, said shell and projection having bot- EDWARD A. RIX. 5 toms spaced from each other, and a take-up Witnesses: plate in the said space between said bottoms, D. B. RICHARDS,

and means for adjusting said plate upwardly. ANNIE E. MITCHELL. 

